code: def test_richclub2():
      T = nx.balanced_tree(2, 10)
      rc = nx.richclub.rich_club_coefficient(T, normalized=False)
      assert rc == {
          0: 4092 / (2047 * 2046.0),
          1: (2044.0 / (1023 * 1022)),
          2: (2040.0 / (1022 * 1021)),
      }
  
file_path: networkx/networkx/algorithms/tests/test_richclub.py
imports: import pytest
  import networkx
label_desc: Use image node_id 4 for calling a global function with example usage: test_richclub2() without return types